Machine for grinding trombone-slides.



P. HOLTON. MACHINE FOR GRINDING TROMBONE SLIDES.- AIfPLIOATION FILED P1213513, unz.

1.076284. Patented Oct. 21, 1913.

2 BHEETB-SHEET 1.

P. HOLTON. MACHINE FOB GRINDING TROMBONE SLIDES.

APPLICATION FILED FEB. 13, 1912. 7 1,076,284. Patented Oct. 21, 1913.

2 BHEIHEBET 2.

UNITED STATES PATENT OFFICE.

FRANK HOLTON, 0F CHIQAGO ILLINCIS, ASSIG-NOR TO FRANK HOL'IQN & 00., OF

CHICAGO, ILLIN-GIS, A CORPORATION 02 ILLINOIS.

MACHINE FOP. GRINDING TROMBONE-SLIDES;-

ncrease.

Specification of Letters Patent.

' Patented Oct. 21, 1913.

Application filed February 13, 1912. Serial No. 677,278.

To all whom it may concern Be it known that I, FRANK :HOLTON, a citizen of the United States, residing at Chi cage, in the county of Cook and, State of Illinois have invented certain new and use ful Improvements in Machines for Grinding Trombone-Slides, of which the following is a specification,

In the manufacturc of trombones, the portions of the members which are telescoped to form the slide are, constructed so that there will be a snug fit and in order topernut freedom of movement of the slide in the finished instrument, the telescoping portions must be ground while a close fit of the-parts must be maintained.

It is one of the objects of the present invention to provide an improved, simple and ethcient machine of this class whereby this grinding may be efi'ecti've-lyaccomplished while at the same time a proper joint will be maintained,

A further object is to provide an improved machine ,Of. this-class havin'gmeans whereby a plurality of slides may be simultaneously ground To the attainm n ftheseend a the accomplishment of other new-=and uscful objeots as will appear thejinven-tion consists in the features of novelty in substantially the construction, oombinationand arrangement of the several parts'hercinafter more fully described and claimed and shown in the accompanying dnawings exemplifying this invention and in which s 1 F igure 1 s a front elevat on of an lm proved machine of this class constructed in I accordance with the principles of this invention. Fig. 2 isa side eleration' oflthe parts shown in Fig; 1. Fig. 3 is a perspective view of a detail. 'Fig. & is a sectional view taken onilineM Fig. 1, Fig. 5' is a de-v tailed secti nal. V w" taken l Fig. 2;

Referring more particularly to the drawings and in the present exemplification ofthis, invention, the numeral 10 designates a support, preferably in the form of uprights,

, upon which the parts are mounted and these;-

uprights may be of any desired height. be- 1 cured to the uprights which are preferably spaced and extending across the space between the uprights is a supporting member ll'whih is arrangedin any gconv'enient position for the operator. Secured to this member 11 are any suitable number of clamps each for holding one of the telescoping members of the instrument. Any number-0t these clamps may be provided, and in the present form of the invention three, are shown. As the specific construction and operation of each of these clamps is the same, a specific description of one 1 ill apply equally as well to them all. I

The clamp comprises spaced jaws 1213, the aw 12 "constituting the mainportion of the clam andispreferably'provided with a base an an upright portion 1-1 extending above'the base adjacent one edge" of the base,

and projecting beyond the upright and the base is an extension 15 preferably in the form of a trunnion whioh'is pivotally engaged with the member 11 preferably by entering a suitable journal in the member. This trunnion 15 serves a support for the rear of the clamp and the frontthcreof is supported in any suitable manner, preferably by means of a link 16 which is pivotally connected as atl'j' with the front edge of the base 1 2 of the clamp and also'by a connection as at '18with abracfket 19, which latter is also secunedtothe member .11 by. suitable fastening devices 20; member 19 isar ran'gedbelow and spaced-from the base 12 of the clamp so that; the clamp will have. free pivotal movement with respect to member 11 andthe link 1 6. One edge of the other member 13 of the clamp engages and rests upon the upright lL-and is secured to the upright in any suitable manner,preferablv by-means .of fastening devj'ices 21.

The members 127 13 Iofthe clamp are-also connected by suitable adjustable fastening devices 22 preferably in thejfor l of screws which; passloosely through the member 13 and have threaded-engagement with the base member 12, A stop s'crew23 is also pro vided for limitingthe extent of adjustment of the member B with respect to the base member 12 andflris stop screw 2-3 passes through and has threaded engagement "with the member 13 while its-extremity engages vand-rests upon the adjacent face of the base member 12' Obriously the member connected loosely with the'uprigln means of the fastening devices zl. so as to permit of a limited adjustment of the member lllwithxrespect to then-use member l2,

and the stop member 23 is provided for pre venting injury to the crossbar 24 of the slide proper -25 of the trombone. The members ,1213 are adjusted so that they will be spaced from each other a suflicient distance to receive and frict'ionally engage the crossbar 24 of the trombone slide and when the members are once adjusted they will be maintainediin this adjusted position so'th'at. one slide may be removed and another placed in position. The clamp thus fmmed is of a width to extend into the space between the sides of the slide member as shown more clearly in F ig.. 1, and are of-a width less than the space so that when the slide 25 is in position, as-shown in Fig. 1, any irregularity or rocking movement which might be causedby the operation of the machine, will be permitted inasmuch "as the clamp will rock about its point of pivotal support and the sides of the slide of the instrument will not strike the bracket 19.

In order to prevent the mutilation of marring of the crossbar 24 any suitable material 26 such as leather, felt or the like may be provided which is secured to the adjacent faces of the members 12l3-of the clamp. \Vhen the clamp members have been once adjusted to the proper position all that is necessary for the, operator is to grasp the slide member and force the-crossbar 24 into the clamp and between the protecting mate rial- 26 in which position the slide will be' fric ionally held.

Scured to the uprights 10 are suitable guies 2? upon which guides a slide -designated generally by the reference numeral 28, is adapted to be reciprocated. This slide 28 may be of any desired or suitable configuration and may be of, any suitable material and is arranged above the member 11. The slide-is provided'at its base with a laterally projecting portion 29 which extends over the clamps. This laterally projectingportion 29 is preferably continuous and is formed in its front edge with cut out portions or recesses 30, the. tter being shaped to conform to the configuration of the joints '31 of the instrument (see particularly Fig.

1) and is of a thickness to receive the joint. This laterally projecting portion 29 constitutes one of the members of a series of clampssimilar to the clamp which is secured to the member 11. The recesses 30 are soarranged v that one will be disposed on each side of the fixed clampwhichis secured to the member 11 so that when the telescoping members of the instrument are placed in positionin the machine, as shown in Fig. 1, the joints 31 will enter the respective recesses 30 and the crossbar 32 will extend across the portion 33 intermediate two of the recesses 30 andwhich portion 33 forms the lower jaw of the reciprocating clamp.

An upright portion34 is provided onthe movement laterally projecting portion 39 and is spaced from the body of the slide 28 and corresponds with the upright 14 of the base member 12.- One edge of the upper member 35 of the reciprocating clamp engages and rests upon the upright 34 and is connected to the upright by suitable fastening devices 36. Screws 37, similar to the screws 22 of the lower clamp are provided which extend loosely through the member 35 and have threaded engagement with the portion 29 and a stop screw screw 23 is of adjustment of the member 35 with respect to the portion 33. Protecting mate rial 39, similar to the material 26 is provided instrument which are connected by the crossbar 32 will not be damaged when the instrument is being inserted or removed from the machine.

The slide28, together with the reciproeating clamp or clamps supported thereby is adapted to be reciprocated upon the guides '27 in any desired or suitable manner. In the present exemplification, however, there is shown a driving pulley 42, the shaft 43 of which is journaled in the suitable bearing44 preferably arranged overhead and .to this shaft 43 is connected a crank arm 45. A pitman rod or'link 46 is pivotally cohnected as at 47 with the slide 28 and has an adjustable connection with the crank arm 45 by -means of which latter the. extent of reciprocating movement of the slide 28' may be varied. In order to effect an adjustment of the pitman rod-or link 46 with the crank arm 45, the latter is preferably provided with a groove or channel 48 in' which is arranged a slide '49 and a fastening device 50 is provided wliich passes loosely through the pitman or link 46, the slide 49 and is threaded into an aperture 51 in the bottom of the'groove or channel of the crank arm.

Any number of these apertures 51 may be provided and it is obvious that they constitute a means whereby a variable stroke of the slide 28 may be provided.

38 similar to the stop provided for limiting the extent It is thought that the operation of this improved ma ine will be clearly understood from the above. description, but briefly stated it is as follows: Duringthe manufacture of the instrument, the slide members are constructed with a very close fit and which fit would not permit a free and easy in the finished When thus constructed the slide members are placed in the machine by forcing the instrument crossbar 24 of the slide memberiproper I 25 between themembers 12-13 of the .fixed clamp and by also forcing the crossbar 32 mom of the other or telescoping member between the jaws of the reciprocating clamp. After these members have been placed in position, the shaft 43 is then rotated which will impart a reciprocating movementto the slide 28, and the continued reciprocation of the slide 28 will cause the telescoping portions of the members 41 to, be reciprocated into and out of the members of the slide proper 25, the latter being held stationary or fixed while the former is be ing reciprocate-d. Obviously some abrasive or grinding material injthe form of a paste or liquid is applied to the telescoping members when th latter are separated. and the constant reciprocation of the parts with respect to eacn other Will cause the abrasive material to correctly and effectively grind the joint. The pivotal movement of the lowermostclamp or the clamp to which the slide proper, in the present form of the in.- vention is connected, will permit the latter to assume a proper position with respect to the other or telescoping member during the grinding operation. After the grindin; has been completed the slide 28 is preferably lowered or brought into close proximity to the other clamp so that both of the members may be gripped by the operator and the instrument readily removed from the machine. Obviously the extent of movement of the slide with respect to the fixed clamp is such that during the reciprocating movement of the slide, the telescoping members Will not be disconnected with respect to each other.

The parts may be arranged in any convenient position and if desired the instrument may be placed into the machine in an inverted position with respect to the position shown in Fig. 1 and various other chages may be made in the arrangement and operation of the parts Without depart ing from the spirit of this invention.

\Vhat is claimed as new i'sz- 1. In a machine of the class described, the combination of cotiperating holding devices for respectively holding the slides of a wind musical instrument. and means for reciprocating the said holding devices, one of the holding devices being also adaptedtor pivotal movement duringsaid reciprocation.

2. In a machine of the class described, the combination of cotiperating holding devices fer respectively holding the slides of a wind musical instrument. and adjustable means tcr reciprocating the said holding devices. one of the holding: devices being also adapted for pivotal movement during said reciprocation.

holding the other and 3. in a machine of the class described, the a combination oil cooperating: clamps t'or rcspcctively holding the slide members of a wind n'iusical instrument. said clamps beipg; adapted fillfitltlliit movement, and

means for imparting such relative movement, one of the said clamps being also adapted for pivotal movement.

t. In a machine of the class described, the combination of cooperating clamps for re spect-ively holdingthe slide members of a wind musical instrument, said clamps being adapted for relative reciprocatin movement, and means for imparting such re. ative movement, one of said clam )s being also adapted for another and independent movement during said relative reciprocating movement.

In a machine of the class described, the combination of cooperating clamps for re-, spectively holding the slide members of a wind musical instrument, said clamps being mounted for relative reciprocating movementand means for imparting such relative movement, one of said clamps being also mounted for free and independent pivotal movement, and during such relative movement.

6. In a machine of the class described, the combination of cooperating holding devices for respectively holding the slide members of a wind musical instrument. said holding devices being mounted for relative reciprocating' movement. adjustable means for imparting such relative movement, one of the said holding devices being also mounted for free and independent pivotal movement during such relative movement.

7. In a machine of the class described, the combination of cooperating holding devices for respectively holdingthe slide members of a wind musical instrument. one ofsa i'd holding devices being fixed and mounted for free swinging movement, the other of said holdingdevices being mounted for movement toward and away from the last recited holding device, and means for imparting the last recited movement.

R. In a machine of the class described, the combination of a support, a holding device' fixed for pivotal V movement with respect thereto and adapted for holding one of the slide members of a wind musical instrument, a slide mounted upon the support, a holding device connected with the slide for movement therewith and with relation tothe other holding device and adapted for cooperating slide member of the instrument, and means for imparting reciprocating movement to the slide and the respective holding device said pivoted holding device being free for oscillation during said reciprocating movement.

J. A machine of the class described to? simultaneously grinding a plurality oi' operating slide members of wind mu'sli instruments, embodying a series of )airs of 10. A machine ofthe class described for simultaneously grinding a lurality of cooperating slide members 0? wind musical instruments, embodying a series of pairs of cooperating holding devices for holdin the plurality of cooperating slide members 0 wind musical instruments, embodylng a series of pairs of cooperating holding devices for holding the ing movement.

respective members of the slides, means for reciprocating the respective holding devices of each pair, one holding device of each air being also mounted for independent swing- 12. In a machine of the class described, the combination of two holding devices for respectively holding in constant engagement the slide members of a wind musical instrument, and means for imparting relative movement to the holding devices, each of said holding devices embodying spaced members, and adjustable fastening devices having engagement with each of the members. I

13. In a machine of the class described, the combination of two holding devices -for respectively holding in constant engagement the slide members of a wind musical instrument, and means for vimparting relative movement to the holding devices, each of said holding devices embodying spaced members, ad ustable fastening devices, and

.a stop device for limiting the adjustment of the members.

14. In a machine of the class described, the combination of two "holding'devices for englaglipg the respective cross bars of the sh e embers 01'! a wind musical instrument and holding the slide members in-constant engagement, means for imparting relative movement to said devices, said devices embodying spaced members between which the cross bar 1s gripped and one of said spaced members having open recesses to receive the aide members of the respective slide memers.

. 15. In a machine of the class described, the combination of two holding devices for engaging the respective cross bars of the slide members of a wind musical instrument 'and holding. the slide members in constant engagement, means for imparting relative movement to said devices, said devices embodying spaced members between which the cross bar is gripped and one. of said spaced members having open recesses to receive the side members of' the respective slide members, said recesses being shaped to receive and conform to the contour of the adjacent joint portion of the slide member.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 7th day of February A. D. 1912. i

FRANK HOLTON.

Witnesses:

J. H. JooHUM, Jr., K. W. VOERNELL. 

